Ill see if i can answer a few of your questions.
At the moment there is no preroll advertising available on videos (will be added soon i believe)

The requirements can be installed by a few people. But the admin here does not do them. If you wish i can give you the email of someone who does the installs for 40 dollars u.s.

Advertising options allow you to do banners and click ads. With a little template knowledge nothing is impossible.

I think paypal is integrated into the script now.